Magnetic substate populations of product nuclei in the 11B(d, p) 12B reaction

Abstract

Magnetic substate populations of product nuclei in the 11B(d, p) 12B reaction have been measured in an energy range E d = 1.3−3.0 MeV at recoil angles of θ R = 55°, 515° and 27°−37°. A static magnetic field (3 kG) was applied normal to the reaction plane to keep the nuclear orientation. Quadrupole effects on the implanted 12B in Ta were utilized to perturb the Zeeman splitting. NMR transitions were induced, and detected by the asymmetry change in the β-decay of 12B. From this information, the magnetic substate populations were determined, for the unique assignment of which the sign of the quadrupole interaction had to be known. For this purpose, a p−γ angular correlation was measured, which determined the alignment of the first excited state of 12B. A comparison of the present result with theoretical predictions is given, together with the resultant information about j-mixings in the 12B states.